Door operating mechanism



5 Sheets-Sheet 1 J. E. BANCROFT DOOR OPERATING MECHANISM Filed Jan. 25, 195:5

July 23, 1935.

July 23, 1935.

J. "E BANCROFT DOOR OPERATING MECHANISM 3 Sheets-Sheet 2 Filed Jan. 23, 1933 July 23, 1935. J c o T 2,008,893

DOOR OPERATING MECHANI SM Filed Jan. 23, 1933 3 SheetsSheet 3 awe/whom Jame SE Bancroft Wm W ual electric motors.

Patented July 23, 1935 UNITED STATES PATENT OFFICE 2,003,893 DOOR OPERATING MECHANISM James E. Bancroft, Bet

lIlfiSlliZ assignments,

Brooklyn,

Application The invention relates anisms and has more operating mechanisms for doors of elevators and of that type operated.

to The Peelle roit, Mich, assignor, by Company,

N. Y., a corporation of New York January 23, 1933, Serial No. 653,199

5 Claims.

to door operating mechparticular reference to passenger by individ- In the present state of the art one type of operating mechanism which has the or of a lever mechanism con s and actuated by a crank through one-half revolution and upon reversal of the a substanrs, but it is ank should. s anything in leaving partly open or partly closed.

The crank is actuated from an electric motor through the medium of a step-down transmission and the inertia of the parts will continue the movement after the motor is ale-energized.

Therefore to stop the crank near its dead center, it is necessary either to de-energize the motor in advance of the completion of movement of the crank or to apply a brake to the mechanism for quickly arresting movement.

mechanism is objectionable as quent service to keep it in proper also complicates and increases adju [-i brake it requires frestment and the cost of the apparatus and generates objectionable noise.

On the other hand, de-energizing tor in advance of the completion of of the mothe crank movement slows the operation and it is difiicult to attain uniformity erations.

of action in successive op- It is the primary object of the present invention to provide a means for accurately stopping the motor and mechanism as to insure the complete closing or the door at each operation. It ject to accomplish this result in a driven thereby,

opening of is a further obmechanism which is operated at relatively high speed. Still further it is an object to obtain the result with an exceedingly simple and inexpensive construction avoiding the use of mechanical brakes or other complications.

Another defect in door operating mechanisms of the type above referred to failure in the power is that in case or" operation it is diiiicult or impossible for the operator within the cage to open the door. of the invention It is therefore another object to obtain a construction with which the door can always be manually opened by the operator within the cage and without disconnecting the power operating means or rendering the same inoperative for fur ther power operations. above,

To attain the various the invention consists in the novel conobjects as struction as hereinafter set forth.

. the drawings:

ning doors; ig. 2 is a similar to two-speed doors;

Fig. 3 is a diagram illustrati cop iections;

Figs. 4, 5 and 6 are views sho operation of the door.

1g. 1 a front elevation showing my imved operator as appli d to a pair of oppositely View showing its application ng the electrical wing the manual In the operation of electric elevators it is quite sued to employ induction motors of the polyphase type and similar tors for operating the doors.

type small individual mo- With my improvement I use the same type of individual door acmotors, but have combined therewith a novel means for overcoming the inertia of the moving parts. This permits of operating high speed and at complete closing or means employed for the mechanism at the same time insuring the opening of the door. thus arresting movement of relatively The the motor and associated mechanism is the passing of direct current through one or more of the field coils, which has the eifect electro-magnetic brake of producing an quickly bringing the mechanism to a stand-still. In some installations D. C. current is available, but if it is not, it can be easily obtained through As illustrated in Fig. 1,

of the induction type which is d the use of a rectifier. A is an electric motor irectly connected to a step-down transmission gearing such as worm gearing B for operating a crank arm C. This crank arm is connected to a lever mechanism for operating the doors, which as shown comprises the link connecting rod D and a bell crank lever E, one arm E a bearing F on of which is slidably connected to the door G. The proportion of the parts is such that one-half rotation of the crank C will move the door shown in full lines in dotted lines. There is also eluding an arm '3 nesting rod I-I a lever complementary door G from closed position to the open position indicated a connection inof the bell crank lever, a conor operating the in the opposite direction.

The electric circuits for controlling the operation of the motor are shown dia Fig. 3 in which i, 2 a three-phase electric service.

tend to an electro-magnetically ing switch 4 which is manually operator through the push butt grammatically in and 3 are the three leads of These leads exoperated reverscontrolled by the ons or other circuit closers 5 and 6. The push button 5 closes an electric circuit including the conductor 7 from the lead 2 and the solenoid 3 for operating the three-pole switch 9 for connecting the conductors l 2*, 3 with the conductors l 2* 3 leading to the motor A. The push button 6 closes a branch circuit through the conductor I including the solenoid 8 for operating the three-pole switch 9 for efiecting a reversing connection with the motor. Thus as shown the operation of this switch 9 will connect the lead I with the conductor l the lead 2 with the conductor 3 and the lead 3 with the conductor 2 To de-energize the motor after each operation, circuit breakers are placed in the electric circuits 1 and l and are operated by the rotation of the crank C as it nears the completion of its half revolution. As shown, a circuit breaker It is placed in the circuit 1 and is operated by a cam J on the crank shaft C. In the same manner a circuit breaker I l is placed in the circuit l and is actuated by a cam J on the crank shaft C. The cams J and J are substantially diametrically opposite each other on the shaft C, the first de-energizing the motor at the end of the door opening movement and the latter de-energizing the motor at the completion of the door closing movement.

As thus far described, there would be nothing to check the inertia of the motor and connected parts after the opening of the motor circuits and therefore as above described I provide an electromagnetic brake which operates as follows: 52 and l3 are D. C. leads and as shown in Fig. 3 the current is derived from the polyphase current through the operation of a rectifier M which receives current from the leads 2 and 3. 'The lead I2 extends to contacts 55 and i6 respectively in the'switches 9 and 9 and the lead it extends to contacts l1 and H3 in said switches. There are, however, circuit breakerslS and 28 arranged in the conductor l3 and respectively controlled by solenoids 2| and 22 in the circuits l and l arranged in parallel with the solenoids 8 and 8 These circuit closers l9 and 20 are provided with dash pots 23 or other means which will delay the opening thereof after their respective solenoids 2l and 22 are deenergized.

. In the operation of the parts as thus far described, the pressing of the push button 5 will simultaneously energize the solenoids 8 and 2|, the former moving the switch 9 so that three movable contact arms 24, 25 and 25 close with the contacts 21, 28 and 29 and connect the conductors I, 2 and 3 respectively with the conductors l 2 and 3 This energizes the motor A and continues the rotation of the same until the cam J operates the circuit breaker it! in the circuit 1, thereby de-energizing the solenoids 8 and 2|. The solenoid 2i when energized closes the circuit closer I9 and after said solenoid is de-energized the circuit closer I!) remains closed for an interval on account of the retarding of movement by the dash pct 23. This gives time for the contact arms. 25 and 26 to move away from the contacts 28 and 2S and close with the contacts l5 and II. As the latter'are supplied with direct current from the leads l2 and i3, and as the circuit closer l9 still remains closed, direct current is supplied through the conductors 2 and 3 to the motor A and will energize the electromagnetic brake for stopping rotation. However, the direct current is only passed through the motor for the brief interval during which the circuit closer IQ remains closed. The operation eifected by the pressing of the push button 6 is similar to closing the electric circuit l and operates the switch il to drive the motor A in reverse direction. This continues until the cam J operating the circuit breaker li ole-energizes the motor and direct current is then supplied thereto during the interval in which the circuit closer 29 remains closed. To avoid the necessity of holding the push buttons 5 and 6 down during the operation, circuit closers 3% operated by the switches 9 and 9 will respectively close shunts around the buttons 5 and 5.

As the lever mechanism for opening and closing the doors is driven by the crank C which is arrested at or near its dead center, and as the transmission B is a worm gear, this would constitute an irreversible mechanism preventing the manual operation of the doors. I have therefore devised a construction of mechanism arranged intermediate the crank and the door which permits of manual operation and without rendering the mechanism inoperative for subsequent automatic operation. This as shown in Fig. 1 comprises a triangular frame having its sides pivotally connected at the several angles and two of the-sides E and E constituting the bell crank lever E before referred to. The third side E is formed with a break joint E therein and an extension E of this side forms an operating handle. Thus when the operator draws downward upon the handle I; it will break the joint E and collapse the triangle permitting the side 13 which is attached to the connecting rod D to remain stationary while the side E which is attached to the door is moved in a direction to open the door as indicated in dotted lines. After such manual operation the door may if desired be manually closed, but if it is not, then an operation of the motor A such as would normally open the door, will restore the lever parts to normal position so that the following operation of the motor to close the door will be effective.

Fig. 2 shows a modified construction of mechanism for operating a telescopic door in which one door leaf K is actuated by a sliding connection with the end of the lever L while another door leaf K is actuated by a link L connected centrally to the leaf L so: as to move said leaf one-halfthe distance of the leaf K. Otherwise the construction of the mechanism is substantially as previously described.

Figs. l, 5 and 6 illustrate a door operating mechanism similar to that shown in Fig. 1 respectively in closed position, in half open position and full open position, effected by manual operation. a a

What I claim as my invention is:

1. In a door operator the combination with power actuated irreversible lever mechanism for opening and closing the door, of a triangular frame forming a bell crank lever and a connecting element in said lever mechanism, the sides of said frame being pivotally attached to each other and normally in rigid relation, and one'of said sides having a break joint therein, and manually operable means for opening said door adapted in its initial operation to break said joint and to permit the collapsing of said triangular frame.

2. In a door operator the combination with power actuated irreversible lever mechanism for opening and closing the door, of a triangular frame forming a bell. crank lever and a connecting element in said lever mechanism, said frame having its sides pivotally attached to each other, one of the sides being connected to the power,

another side to the load and the third side having a break joint therein, and manually operable means for breaking the joint in said third side to collapse said frame and to open the door without actuation of said power means.

3. In a door operator the combination with power actuated irreversible lever mechanism for opening and closing the door, of a triangular frame forming a bell crank lever and an element of said lever mechanism, said frame having its sides pivotally attached to each other, one of said sides being connected with the power, another side connected with the load, and a third side having a break joint therein, and a lever forming an extension of said third side adapted to break said joint when said mechanism is in position for closing the door and to move said load side relative to said power side to open the door.

4. In a door operator, the combination of a reversible electric motor, a step-down transmission mechanism, a crank operated thereby, means for energizing said motor to alternately operate the same in reverse directions, means for de-energizing said motor when said crank has moved through slightly less than one-half revolution, and a lever mechanism actuated by said crank to open or close the door including a triangular frame forming a bell crank lever, the sides of said frame being pivotally attached to each other and normally in rigid relation, one of said sides having a break joint therein and means manually operable when said motor is stationary for breaking said joint and collapsing said triangular frame to thereby open said door.

5. In a door operator, the combination with a power actuated irreversible mechanism, of a lever mechanism actuated thereby for opening and closing the door including a triangular frame forming a bell crank lever, the sides of said frame being pivotally attached to each other and normally in rigid relation, one of said sides having a break joint therein, and means manually operable when said irreversible mechanism is stationary for breaking said joint and collapsing said triangular frame to thereby open the door.

JAMES E. BANCROFT. 

